"as i myself have indicated i have no problem with a few of the grand old temples being converted to tourist spots to showcase our architectural capabilities but basically we have to bear in mind that a temple, church or mosque is a religious place meant for our communion with god and as such needs to be tretaed with reverence and not as a pure tourist spot and there certainly needs to be a restriction on entry of non believers in and around the sanctum sanctorum "
This is what I would call as a neutral view point.There are many temples where people from any religion can enter.Like iskcon temples,aiyappa temple in sabari mala,pillyar temples in many villages,aiyanar temples etc.Nobody stops anybody from going there.
In islam dhargas are open for all though purist muslims wont visit dhargas and wouldnt even call them as islamic.But as dr sridhar suggested,some hindu sects will feel hurt if a non hindu enters their temple.For example sri vaishnavas will not allow non hindus to enter temples.We should respect their sentiments.That is secularism.Forcing secularism on someone is like the foolish act in france which banned hijabs.How can a government regulate a personal religious belief?
But our architectural marvels too should be highlighted to outside world.But that need not come at the cost of sacrificing religion.There has to be some way to do it.